Nano-scale transient events in the solar transition region

Details Nano-scale transient events in the solar transition region Nano-scale transient events in the solar transition region

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..693m&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Sun: Atmosphere, Transition Region, Evolution, Magnetic Fields, Magnetohydrodynamics, Numerical

Scientific paper

In the present paper a physical model of blinkers based on magnetic reconnection is developed. Blinkers were first found in transition region lines by SOHO CDS. Their typical lifetime is approximately 16 minutes, the intensity enhancement ratios are around 1.8, and they appear at 1 - 20 s-1 on the solar disk. Blinker events seem to be increases in density and/or filling factor rather than increases in temperature. Most blinkers have a repetitive nature and a high percentage of these events occur above unipolar magnetic fields. Magnetic reconnection in the lower transition region of the solar atmosphere is numerically simulated by solving the fully nonlinear, time-dependent, dissipative, radiative 2D MHD equations. Setting the initial parameters describing transition region explosive events, we computed the evolution of the reconnection jets. Taking into account the limit of the spatial and temporal resolution of the CDS camera and converting the high-resolution numerical results into "CDS-resolution", the propagating reconnection jets are found to have similar properties as those described by CDS blinker observations. These results suggest SOHO CDS may actually observe reconnection driven explosive events as blinkers.

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